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Standard XII
Physics
Linear Momentum
A nucleus mas...
Question
A nucleus ( mass no. 238 ) initially at rest into another nucleus ( mass no 234 ) emitting an
α
particle (mass no-4) with the speed of
1.17
×
10
7
m/sec. Find the recoil speed of the remaining nucleus.
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Solution
the nucleus was at rest initially.
so, it has momentum
=
0
as,man of
α
-particle has speed
V
1
=
1.17
×
10
7
m
/
s
from conservation of momentum
m
1
v
1
+
m
2
v
2
=
0
v
2
=
−
m
1
v
1
m
2
=
−
4
×
1.17
×
10
7
234
=
−
2
×
10
5
m
/
s
∴
recoil velocity of nucleus =
2
×
10
5
m
/
s
.
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